27997229 has 4 divisors (see below), whose sum is σ = 30150876. Its totient is φ = 25843584.

The previous prime is 27997213. The next prime is 27997237. The reversal of 27997229 is 92279972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1885129 + 26112100 = 1373^2 + 5110^2 .

It is not a de Polignac number, because 27997229 - 2⁴ = 27997213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076804 + ... + 1076829.

It is an arithmetic number, because the mean of its divisors is an integer number (7537719).

Almost surely, 2^27997229 is an apocalyptic number.

It is an amenable number.

27997229 is a deficient number, since it is larger than the sum of its proper divisors (2153647).

27997229 is a wasteful number, since it uses less digits than its factorization.

27997229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153646.

The product of its digits is 285768, while the sum is 47.

The square root of 27997229 is about 5291.2407807621. The cubic root of 27997229 is about 303.6488797285.

The spelling of 27997229 in words is "twenty-seven million, nine hundred ninety-seven thousand, two hundred twenty-nine".